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A follow-up study on the relation of malocclusion and temporomandibular joint MRI and helical CT findings in temporomandibular disorder patients

颞下颌关节紊乱病患者咬合不正与颞下颌关节MRI及螺旋CT表现关系的随访研究

基本信息

批准号：
11671926
负责人：
SAKURAI Naoki
金额：
$ 1.86万
依托单位：
NIIGATA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

项目摘要

Purpose : This follow-up study investigated the relation of malocclusion and temporomandibular joint MRI and helical CT findings in temporomandibular disorder patients.Methods : The subjects in this study were divided into three groups based on MRI and helical CT assessments : disc displacement with reduction(DDWR) ; disc displacement without reduction(DDWOR) ; and normal subjects. The occlusal contacts and occlusal bite force of all subjects were determined using occlusal registration strips or black silicone(bite checker)and Dental Prescale(pressure sensitive sheet), respectively.Results : In the intercuspal position, the number of occlusal contacts and total occlusal bite force of the DDWOR TMD patients group was lower than those of the normal control group. In the lateral position, the occlusal force in the non-working side molars of the DDWOR TMD patients group was higher than that of the normal control group. In the edge to edge occlusal position, the occlusal force in the molars was not significantly different, but the percentage of subjects who had occlusal contacts in the molars of normal control group was lower than those of the patients group.Based on the data gathered, the follow-up MRI results of many subjects showed no discernible change compared with their initial MRI results. However, some of the DDWOR TMD patients showed remarkable erosive change of the condyle as revealed in their helical CT results. Further, many TMD patients exhibited greater total occlusal bite force(in the intercuspal position)during the follow-up procedure compared with the previous examination.

目的：方法：根据颞下颌关节紊乱病患者的MRI和螺旋CT检查结果，将患者分为3组：复位型关节盘移位（DDWR）组、未复位型关节盘移位（DDWOR）组和正常对照组。结果：在牙尖交错位，DDWOR TMD患者组的咬合接触数和咬合力均低于正常对照组，差异有统计学意义（P < 0. 05）。在侧位时，DDWOR TMD患者组非工作侧磨牙的咬合力高于正常对照组。在边对边咬合位，磨牙咬合力无显著差异，但正常对照组磨牙咬合接触的受试者比例低于患者组。根据收集的数据，许多受试者的随访MRI结果与初始MRI结果相比无明显变化。然而，DDWOR TMD患者的螺旋CT结果显示，部分患者的髁突出现明显的侵蚀性改变。此外，许多TMD患者在随访过程中表现出更大的总咬合力（在牙尖交错位置）与以前的检查相比。